The characteristic plateau in the action potential developed during cardiac muscle contraction is:
a. caused by the removal of calcium ions from the sarcolplasmic reticulum and their transfer to the interstitial fluid outside of the cell
b. due to the opening of fast sodium channels in the sarcolemma
c. produced by the tendency of cardiac muscle fibers to repolarize very quickly
d. the result of the gradual opening of voltage gated calcium channels and the slow movement of calcium ions to the inside of the cells

Anurse recently administered filgrastim intravenously to a client who has cancer and is receiving cytotoxic chemotherapy. for which of the following data, discovered after the medication was administered, should the nurse consider filling an incident report? a. the client had chemotherapy 12 hr before the medication was administered. b. the nurse flushed the client’s iv line with d5w before and after the medication was administered. c. the client’s absolute neutrophil count was 2,500/mm^3 before the medication was administered. d. the medication vial sat at the room temperature for 2 hr before it was administered.